What it covers: The building blocks of music — pitch notation and clefs, half and whole steps, major scales and key signatures, rhythmic values, meter, and expressive markings.
Exam weight: AP Music Theory is weighted by section, not by unit (45% multiple choice, 45% free response, 10% sight-singing). Unit 1 content underlies almost every question on the exam.
The big question: How does music notation encode pitch, rhythm, and expression so a performer can reproduce exactly what a composer intended?
Big Ideas covered: Pitch (BI 1), Rhythm (BI 2), Music Design (BI 4).
Key topics at a glance
Pitch, the Staff & Clefs
Pitches sit on the staff (5 lines, 4 spaces) plus ledger lines. Treble (G) marks G4; bass (F) marks F3; alto/tenor (C) clefs mark middle C.
Half & Whole Steps
A half step is the smallest interval; a whole step = two half steps. Accidentals (♯ ♭ ♮) raise/lower by a half step; enharmonics are two names for one pitch.
Major Scales
Built on the pattern W–W–H–W–W–W–H. Scale degrees: tonic, supertonic, mediant, subdominant, dominant, submediant, leading tone.
Key Signatures & Circle of Fifths
Sharps: F C G D A E B; flats reverse it. Last sharp + half step = major tonic. Second-to-last flat = major key (one flat = F major).
Rhythmic Values
Whole → half → quarter → eighth → sixteenth, each halving in duration. Dots add half a value; ties join durations across a pitch.
Meter & Time Signatures
Simple = beat divides in two; compound = beat divides in three. Meters are duple, triple, or quadruple. 6/8 = compound duple.
Tempo
Italian terms from slow to fast: Largo, Adagio, Andante, Moderato, Allegro, Vivace, Presto. Metronome markings give beats per minute (e.g., = 120).
Dynamics & Articulation
Dynamics: pp p mp mf f ff, plus crescendo/diminuendo. Articulation: staccato (short), legato (smooth), accent (emphasized).
The key terms you must know
Clef — a symbol that fixes the pitch names of the staff lines and spaces (treble, bass, alto, tenor).
Half step / whole step — the smallest interval vs. two of them; the building blocks of every scale.
Accidental — sharp (♯), flat (♭), or natural (♮) that raises or lowers a pitch by a half step.
Enharmonic equivalent — two spellings for the same pitch (C♯ = D♭).
Major scale — the W–W–H–W–W–W–H pattern of whole and half steps.
Scale degree — the numbered/named position in a scale (tonic, dominant, leading tone…).
Key signature — the sharps or flats at the start of a staff that define the key.
Circle of fifths — keys arranged by perfect fifths; the master map for key signatures.
Simple vs. compound meter — beat divides into two vs. into three.
Time signature — two numbers giving beats per measure and the beat unit.
Tempo — the speed of the beat (Italian terms or metronome markings).
Dynamics & articulation — how loud a passage is and how each note is attacked/released.
Key themes to remember
Notation is a code for sound. Every symbol — clef, note head, dot, dynamic — tells the performer exactly what to do.
Half and whole steps build everything. Scales, keys, and eventually chords all come from stacking these two intervals.
The circle of fifths is your best friend. It instantly gives you key signatures, relative keys, and closely related keys.
Meter is about how the beat divides. Ask "does the beat split into 2 or 3?" before naming any meter.
Expression matters. Tempo, dynamics, and articulation turn correct pitches and rhythms into actual music.
Common exam traps
Don't miscount whole vs. half steps. B–C and E–F are natural half steps (no black key between them) — a frequent trap when spelling scales.
Watch the clef. The same line is a different pitch in treble vs. bass vs. alto vs. tenor clef. Identify the clef first.
Sharp-key vs. flat-key rules are different. Last sharp → up a half step for the tonic; second-to-last flat → names the key. Don't mix them up.
Simple ≠ compound. A top number of 6, 9, or 12 signals compound meter — the beat is a dotted note, not the bottom-number note.
A dot is not "add one beat." A dot adds half the note's own value, which depends on the note (dotted half = 3 beats, dotted quarter = 1½).
Enharmonic spelling can be wrong even if the pitch is right. In a given key you must use the correct spelling (e.g., G♯ not A♭ in A major).